Fastening device for piston-pins, &amp;c.



FASTBNING DEVICE :PoB'PIs'roN may@ 4 APPLICATION FILED JAE. 11, 1911.

'citizen of thellnited States, residing at thev pistons.` This construction is objectionable because it strains the piston and causes v is a fragmentary longitudinal section'of a fpiston and piston rod.

means of set screws working in ythreaded A'rENT 0F ,ernaar B. snun'rz, orfsnrrano, New Yonai EASTENING :DEVICE FOR PISTQN-PINS, ricci Spec'ication oi' Letters Patent'. A Patentd Augj 5, j gL i Application le January 11, 1911. Serial No. 601,975.

To all whom it "concern:

Be it known that l., linearer B. SHULTZ, a

Buffalo, in the county of Erie and State of New York, have invented new and usefjul linprovernents` in Fasteniin.;` Devices for Pis ton-Pins7 Sac., of which the following is a specification. I

This invention relates to a fastening; device which is more particularly designed for 'holding' piston pins in piace in the pistons of gas and Aother engines, so as to prevent the same from becoming loose, although this invention may also be used in 'other places where like conditions exist. These piston pins have heretofore been held inplace by bosses ot'the pistons and engaging; with the outer sides of the piston pins which were arranged in sockets formed in the bosses of the same to become distorted or sprungout of shape, whereby the piston is caused to fit unevenly within the cylinder and results in leakage through the joint between. the piston and cylinder and thereforeimpairs the etliciency of the engine due to loss of coin-pression'. Y.

lt is the object of this invention to provide a fasteningdeviceitor this purpose which permits of securely fastening the piston pin in the piston so as .to prevent displacement thereof without distorting Ior twist-ing the piston, thereby avoiding the objections above mentioned,

In the accompanying drawings: Figure l Idas 'engine showing the pistonandpiston pin connected by my improved; astening device.` Fig. 2 is a fragmentary sect-ion 'taken in line 2 2, Fig. 1. Fig. 3 is altoppla'n view olt the piston pin detachedt'rom the Similar letters of reference indicate corresponding parts throughout the several views. n

A represents the cylinder ,of a gas engine, B the pist-on reciprocating' therein and C the piston rod which is pivotally connected with this piston. This pivotal connection consists of ai hollow cylindrical piston pin D arranged transversely in the piston and having the piston rod or pitrnan pivotally mounted on the central part thereof. At its opposite ends this hollow piston pin is seat 'fend of the piston pin and'. is arrmanged in the adjacent outer passageway H of the respective boss and is also providedfwith a the eljciency of thefen'gi'ne accordingly.

'the piston. ln itsjfvreferred torni this tas telling' device constructed as follows: At each end the piston pin is provided on one side with a screw threaded opening.; f and on its diametrically opposite side the same is provided with a longitudinal slot G eX- tending to the respective end of the pin, so that in eHectthe pin is split. Each of the bosses isprovided on one side in line with the threaded opening of the piston pin with a plain outer passageway or clearance opening H andon its diarnctrically opposite side in line with the slot in the adjacent part of th'episton pin with an inner passageway or clearance openingi. l f 'J represents two set screws each of which is provided with a threaded part which enn gages with the threaded opening' f in one conical inner part or end 7c which engages with opposite walls of the companion slot- G' of the piston pin and is also adapted to enter the inner passageway z' in the boss adjacent to the4 slot. ,After the piston pin has been slipped through the bosses of the piston and the pit man or piston rod each ot' the' set screws is irst passed through an outer passageway H, then screwed through the threaded openiup; f of the piston pin suliiciently to engage the. conical inner end thereof with the walls' oi. the slot and cause this part of the piston pinto spread and hind against the bore of the respective socket or seat in the boss. The capacity of the piston rod to thus spread is due to the longitudinal slot therein which in eectpractically converts the sanne 100 liability of-.distorting'the latter and causing 105 the same to bear unevenly at its periphery. against the bore ofthe cylinder which otherwise would 'cause uneven 4wear and leakage in the joint between ,theseparts and reduce After the set screwfhas been tightened as nuchas is necessayto hold. the piston so Y . of the piston pin.

` pin in piace within the piston the set screw' held against displacement hy means oi a in order to avoid the liability of cracking' l the piston pin upon spreading the slotted part thereof the inner end of this slot is irovided with a circular' enlare'ement an, as

. r v n i shown in Ngs. l. and lhat part of tne slot in the 'piston pm which is engaged hy the conical port of the set screw is .'ilso enlarged so as to practically forni a cylindrical sea-t n. on the walls of this slot which pro- .vides a compa atively large hearingl sur- :tace 4for the conical ace or .end of the set `screw to engage with and thus avoid the production of a cutting' edge.- i claim as my invention:

. The combination of a body having a socket, a hollow pin arranged in said socket and provided on one side with. a threaded opening and on its other side with a longi tndinal slet, and a set screw f having a tl'ireaded part engaging with said openingh and a conical part engaging with theA walls of said slot. 2. The combination of a piston provided with boss which contains a cylindrical socket and passagevvays on opposite sides of said socket, a, hollow piston pin arranged in said socket fund provided on one side with nl threaded opening end on its other side with a longitudinal slet, and a set. screw ranged in said passageway and having a threaded part engaging with said threaded opening and a conical. part engaging with he walls of said slot.

3. '.lhe combination with a piston provided with a boss which contains a cylindricfii socket and passi-rgeways'on opposite sides oli said socket, a hollow piston pin arranged i11- seid socket and provided on one side with -a threaded opening and on its other `side with a longitudinal slot, a set screw arranged in said passageway and having a threaded part engaging with said threaded opening and a conical part engaging with the Walls of said slot and jam vof the set screw being enlarged.

nut applied to said screw 'and hearing against the outer side of said boss. j

Ll. Thecoinhination of a piston provided with e boss havin ways on opposite sides ofsaid socket, av hollow piston pin arranged in said socket and provided on one 'side with a threaded opening whichI registers with one of said passageweys and a longitudinalslot on. its :opposite side which registers with the other passageway and a set screw having a thread- 'ed part engaging with the threaded opening of said pin and arranged in the adjacent guidew'ay and a conical part engaging with the lwalls of said slot and adapted to enter the adjacent passageway. Y

T he combination of piston provided with a boss .hu-ving e socket; and passageways on opposite sides of said socket, a hollow piston pin arranged in said socket and provided on one side with a threaded opening which registers with one oi-v said passageways and a longitudinal slot on its opposite side which registers With the other passageway, and a set screw having a threaded part engaging with the threaded opening of said pin and arranged in the adjacent guideway and a conical port engag- 'in with the walls of said Y slot and adapted to enter the adjacent passageway,'that part of the slot which receives the conical part- -6. The cfoirihination-v pist-on provided with a boss having a socket, and passagewajvs on opposite sides of said socket, a hollow piston pin arranged in said socket and provided on one side with a threaded Opening which registers with ene of said passagcways and a longitudinal sloton its opposite side which registers with the other j'mssageway, and a set screw having; a tlneadcd part engaging with the threaded opening oi said pin and arranged in the adjacent'guidewayfand a conical part engag-- ing with the walls of said slot sind adapted to enter the adjacent passageway, that part oi' the slot 'which receives the conica] j art of the set screw being enlarged und the inner end of said slot elso'bcing enlarged. l

Witness my hand this 9th day of January, 191.1.

, ALBERT B. SHUL'lZ. Witnesses:

y Trino. L. Pori',

ANNA Hisieis.

a socket, and passage` 

